Improvement in machines for cutting sloped nicks in wood-screws



T. J'. SLUAN. MAUHI'NNE-S'FOR CUTTING SLOPED NTC-KS IN WOOD SCREWS. No, 180,280, Patented July 25,1876

THOMAS J. sLoAN, oF'nEwLYoRK, N. Y. f

IMPROVEMENT III MACHINES FOR CUTTING sLoPED NIcKs INwooD-SCREWS.

Speciiieation forming part of Letters Patent No. l $0,280, dated July 25, 1876; application `filed February 28,1876.

To all whom it may concern:

Be it known that I, THOMAS J. SLoAN, of the city, county, and State of New York, have invented an Improvement in Machinery for Making Wood-Screws, of which the following is a specification:

This invention is especially designed for the manufacture of the wood-screw set forth and described in my Letters Patent No. 172,351, granted to me January 18, 1876, and is supplementary or additional to the invention set forth in myLetters Patent N o. 17 3,355, dated February S, 1876, the machinery described in this last-named patent being, in certain respects, modified in the application to use of my present invention, hereinafter fully set forth.

My said present invention consists in the combination, with a tixed blank-holder, of a nicking tool or cutter constructed and arranged to cut, first, the one sloped side of the nick in the head of the screw; then the comparatively shallow central portion of said nick; and, finally, the remaining sloped side thereof, the necessity ot' rotating the blankholder being, byethis means, avoided, and the.

requisite sloped nick provided in the screw with great accuracy, and with comparative cheapness in the manufacture of the screw.

Figure l is a plan view of the'machine.

Figs. 2 and 3 are detail views representing my said invention.

It is to be understood at the outset that, except in the particulars herein particularly specified, the machine, in its general construction and operation, is identical with that described in my Letters Patent N o. 173,355, aforesaid, to which, for description not herein given, reference is made.

It is further to be understood' that the blankholder or blankholding spindle, instead of having a half-revolution at each cut of the nicking-tool, to enable the nick to be made onehalf from each side of the screw-head, is fixed or stationary during the nicking operation, and-1I the devices employed in the machine shown iu my said Letters Patent No. 173,355, 'to give the axial intermittent rotation to the blank-holding spindle during the nicking operation, must, for the purposes of my present invention, be eliminated. Furthermore, the

arrangement and operation of the cutter or nicking-tool are changed, so that, in my present invention, it is constructed for operation as follows: j

The cutter E is carried on the end of the shaft A2, which rotates in bearings provided in the upper or free ends of swinging standards B2, the lower ends of which latter are pivotedrto sliding blocks E2, capable of a vertical movement in upri'ght guidesD2. vThe shaft A2 of the cutter (nicking-tool) Eis rotated from the gear Lll by a system of gears, L2 K2. (Shown'in detail in Fig. 2.) From the shaft A2 extends arod, F2, which connects at the lower end with one arm of alever, G2, the opposite arm of which rests in contact with a cam, H2, o n the shaft l2. From one of the sliding blocks E2 extends rod M2,

which connects with lever N2, the opposite arm of said lever restingin contact with the second cam R2. Springs c 11 serve to hohl the rods F2 and M2 in proper relation with the adjacent ends of the levers just mentioned.

lnpractice the sliding blocks E2 should be connected by a transverse bar, to which, in

such case, the rod M2 is attached, instead of y direct to one of the blocks, as shown in thel drawings, by which means greater stcadiness and freedom from' twisting in its bearings is secured to the shaft A2.

In the operation of the machine, the blank being held in the jaws of the holding-spindle, as indicated in Fig. 3, the rotation of the shaft l2 and cam R2 thereon causes the lever N2 to lift the blocks E2, and thereby tilt inward the saw to cut the lower half of the nick in the head of theblank held in the jaws, as afore said. This done, the further rotation of said shaft causes the camH2 to lift the sa\v,.also tilting the latter back, and into -such position that the further rotation of said' shaft, by causing the part 6 of the cam R2 to operate on the lever N2, and cause it to lift the blocks E, again tilts inward the saw to cut the upper or opposite slope or half of the nick in the head of the blank, the release of the two levers by the two cams permitting the saw to resume its original position preparatory to a repetition of the operation.

It will be especially noted that in this operation of nickingthe head of the blankthe saw traverses across the said head of the blank, i'roni one side to the other, With the depth of its cnt regulated by the movement given to it by the variable and relative movements ofthe two actuating-levers.

What l claim as my invention is In an organized machine for making slopenicked screws, the combination, with a blankholdcr, Xed as concerns rotation on its own axis, of a nicking tool or cutter7 constructed and arranged to cut the sloped nick of the head of the blank directly across, from one side to the other, Without turningthe blank, substantially as set forth. 1

THOS. J. SLOAN. Witnesses:

H. WELLS, Jr.,

EDWARD HOLLY. 

